MySQL

Export all data in the entire database1. Under the Linux command line, enter:Mysqldump-u username-p dabasename > Filename.sqlFilename.sql Better Add path nameTo export data from a table in a databaseMysqldump-u username-p dabasename tableName >

MySQL replaces the contents of the table field, as in the example:Mysql> Select Host,user from user where user= ' testuser ';+-----------------------+----------+| Host | user |+-----------------------+----------+| Localhost.localdomain| TestUser |+--

The approximate steps are as follows:1: Stop MySQL server2: Start MySQL with Mysqld_safe3: Change root password4: Exit, restart MySQL server Step One: There are several ways to stop the MySQL server:1. Stop MySQL with service mysqld stop2. If not,

Today I would like to compare a variety of performance optimization strategies that can be used on a greenfield project . In other words, the project has not been optimized for the constraints imposed on it by previous decisions.Specifically, the

--warning:skipping The data of table mysql.event. Specify the--events option explicitly.Mysqldump-uroot-pxxxxx--all-databases > All.sqlMySQL prompts "-warning:skipping the data of table mysql.event when exporting the database with mysqldump. Specify

SELECT table_name ' table name ', Table_schema ' database name ', ordinal_position ' order ', column_name ' field ', Data_type ' type ', character_octet_length ' bytes long ', if (column_key= ' PRI ', "√", "") ' primary key ', if (extra= '

mysql> CREATE TABLE ' ROOTTB ' (' ID ' INT (one) UNSIGNED auto_increment not NULL,' Data ' VARCHAR (+) not NULL DEFAULT ' ',-PRIMARY KEY (' id ')) Engine=innodb;Query OK, 0 rows affected (0.60 sec)mysql> CREATE TABLE ' SUBTB ' (' ID ' INT (one)

-----backup---------The file will not be overwritten, and MySQL will automatically generate a nonexistent file if there is an errorSELECT * FROM table name into OUTFILE ' D:\text.txt 'Field TERMINATED by ', '--query out the fields with ', ' to

#!/bin/sh## mysqldthis Shell script takes care of starting and stopping#the MySQL Subsystem (MYSQLD).## Chkconfig:-64 36# Description:mysql database server.# Processname:mysqld# config:/etc/my.cnf# Pidfile:/var/run/mysqld/mysqld.pid# # # BEGIN INIT

The external network database is the main, intranet database is from. First make sure that the server firewall where the primary database is located is open.If the database already has data at the beginning of the decision , a lock table operation

The so-called thing is a set of atomic SQL statements, or a separate unit of work. 　　1, things have four characteristics:① atomicity (atomicity): A thing must be divided into an indivisible minimum unit, and all operations in the whole thing are

Background:If you want to store some results returned by cryptographic functions that may contain arbitrary byte values, use BLOB columns instead of CHAR or varchar columns to avoid potential problems that change some data values due to the deletion

1. PhenomenaOn the command line, execute the SQL statement if it contains a question that says "Data too long for column name ' at row 1" or the result in the command line query, Chinese garbled 2. Analyze A. View the default encoding of the command

[1] When the database is deleted after the recovery methodFirst, create a test database.Mysql-u root-p123123← log in to MySQL server with root enter password:← Enter the root user password for MySQLWelcome toThe MySQL Monitor. CommandsEnd with

Defining the PHP Character setHeader ("content-type:text/html; Charset=utf8 ");Connecting to a database￥con = mysql content ('localhost', ' root ', 'password');Define insert data database character setmysql_query (' Set names UTF8 ');//mysql_query

In the MySQL in statement is the appearance and the inner table as a hash connection, and the EXISTS statement is the external loop loop, each loop loop and then query the internal table. It is not accurate to say that exists is more efficient than

1.PRIMARY key can also be specified as key only. The purpose of this is to be compatible with other database systems, and key is the index of the consent word!2.In a unique index, all values must differ from each other. If you use a keyword that is

Mysql is completely deleted under win7First, stop the MySQL service in the Service (Start> Control Panel> Management Tools> service. Open Control Panel-add and delete programs, find MySQL, and uninstall. You can also uninstall it with 360 security

MySQL Error Log (ErrorLog) Like most relational databases, log files are an important part of MySQL databases. MySQL has several different log files, such as error log files, binary logs, common logs, and slow query logs. These logs help us locate

Simple MySQL database master-slave synchronization configuration, mysql database master-slave Master Configuration: The Code is as follows:Log-bin = mysql-binServer-id = 1Binlog-do-db = powerdns # database to be synchronized Add an slave account to